Data Sheet

37. Series-Parallel Circuit Paths
Build the circuit above. In this circuit, the lamp (76) that indicates current ow cannot turn on by just turning the switch
(62) ON. If you turn the switch (62) ON and press and hold the press switch (61), then current will ow. Or if you turn
the switch (62) ON and move the magnet (7) towards the reed switch (83), then current will ow. Since switch (62) is in
series with the other two switches that are in parallel, this makes a series-parallel circuit path for the lamp (76). This kind
of circuit could be used in a hotel room where your key card must be inserted in a card holder near the door to enable
a closed circuit, but you still need to turn on switches in the room to have certain lights or devices close the circuit and
turn on.
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